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Simplifying 8x + 9y + 3z = -15 Solving 8x + 9y + 3z = -15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9y' to each side of the equation. 8x + 9y + -9y + 3z = -15 + -9y Combine like terms: 9y + -9y = 0 8x + 0 + 3z = -15 + -9y 8x + 3z = -15 + -9y Add '-3z' to each side of the equation. 8x + 3z + -3z = -15 + -9y + -3z Combine like terms: 3z + -3z = 0 8x + 0 = -15 + -9y + -3z 8x = -15 + -9y + -3z Divide each side by '8'. x = -1.875 + -1.125y + -0.375z Simplifying x = -1.875 + -1.125y + -0.375z
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